limbic system Flashcards
1
Q
limbic lobe composed of
A
a more primitive portion of the cortex, and it includes the:
- cingulate gyrus,
- retrosplenial gyrus,
- subcallosal gyrus, and
- parahippocampal gyrus
2
Q
limbic lobe definition
A
- introduced by Broca
- telencephalic structures that circle the foramen of Monro and border diencephalon
- comprised of gray matter
3
Q
limbic system definition
A
- structures that interface between the cortex and the hypothalamus and modulate the motivational and emotional functions initiated by the hypothalamus
- includes all structures that are linked to limbic lobe that project to hypothalamus or its targets
4
Q
limbic system function
A
- receive cortical input and modulate hypothalamic functions
- control of emotion, motivated behavior, and memory
5
Q
observations of limbic system clinically
A
- lesion: results in no paralysis or sensory deficits
- seizure/electrical: do no produce clonic movements or sensory perceptions
- excitation: evokes emotional states or memory fragments
6
Q
anatomy of hippocampus
A
7
Q
papez circuit
A
- controls motivation and emotion
- Start: hippocampus (HPC) interlocking cell layers.
- Output = fornix
- Fornix > mammillary bodies > anterior nucleus of the thalamus via the mammillothalamic tract (MThT)
- fibers > internal capsule to the cingulate
gyrus - Cingulate gyrus > the entorhinal cortex >
hippocampus.
8
Q
See slides 12-20 for cross section images and labels
A
9
Q
Henry Molaison
A
- removal of hippocampus to prevent spreading of seizures
- symptoms: Severe memory deficit, Loss of memory consolidation, No emotional issues
10
Q
declarative memory
A
- short term memory consolidated to long term memory
- if you study it will be short term but repetitively it will be consolidated into long term memory
11
Q
place cells of hippocampus
A
- if you have an issue with short term memory (like HM after removal of hippocampus) you will still have long term memory
- you can still navigate places from long term memory, but won’t be able to use short term memory
12
Q
role of hippocampus
A
- memory consolidation
- spatial navigation
13
Q
uncus
A
- next to the parahippocampal gyrus
- Inside the uncus is the amygdala
- Uncus = hook
14
Q
location of amygdala in cross section
A
15
Q
amygdala pathways
A
- stria terminalis
- ventral amydalofugal pathway
18
Q
Kluver-Bucy syndrome
A
- removal of amygdala
symptoms: - Tameness
- loss of fear and other emotional reactions
- hypersexual
- bulimia
- Toral tendencies
- hypermetamorphosis: short attention span
